y^2+4*y+4+2*y^2+4y=3*y^2+8y+4
У = 9х + 8
Х = 0
у = 8
Ответ ( 0 ; 8 )
<span>cos(х+3π/7)=-1</span>
<span>x³+2x²-x-2=0</span>
<span>открываем скобки</span>
<span>x²(x+2)-(x+2)=0</span>
<span>получаем</span>
<span>(x²-1)(x+2)=0</span>
<span>отсюда</span>
<span>(x-1)(x+1)(x+2)=0</span>
<span>x1 = 1</span>
<span>x2 = -1</span>
<span>x3 = -2</span>